Clamp thumb tack



ocr. 3Q, 1923. 1,472,411

J. W. HOPE CLAMP THUMB TACK Filed 061'.. 5. 1922 wf u r lllllllllllllllllllll:lmlllhllll QJZIZ'MHQLW y y qd 7@ my Fatented Get. 30, i923.

JOHN W. HOPE, OE' PITTSBURGH, PENNSYLVANIA.

CLAMP trauernV TACK.

Application led (ctober 3, 1922. Serial No. 592,131.

Thumb Tacks, of which the following is a.

specication.

rlhis i vention relates t-o clamp thumb tacks and has particular*reference to the improved construction of thumbtacks of the type used for holding paper or tracing cloth on the drawing board, or for holding` down price tags, such as used in grocery and other stores.

rThe principle object of this invention is to provide a clamp thumb tack, which does not pierce a hole through the material, when tacked to a drawing board or shelves.

Another important feature of my inventionprovides means for removing the material quickly without the use of tools or knives or, as is generally done, the finger nails, causing the latter to break.

Another object of my invention is to de# sign a clamp thumb tack with such regard Y to proportion and arrangement of parts that it will embody the essential features of simplicity, durability and eiiiciency, and also relatively low cost of manufacture.

The above and other incidental objects of a similar nature, which will be hereinafter more specically treated, are accomplished by such means as are illustrated in the accompanymg drawings, described in the following specification, and then more particularly pointed out in the claims, which are appended hereto and form part of the application.

Referring now to the drawings, wherein there hasy been illustrated the preferred embodiment of this invention as it is reduced to practice, and throughout the several viewsl of which similar reference characters designate corresponding parts,

Figure l is a perspective view of the invention.

Figure 2 is a side elevation of the device in open position.

Figure 3 is a cross-sectional view on line Figure 4 is a front elevation of the -invention in clamped position.

tion. p

Figure 6 is a side ing lever.

' Figure 7 is a top` elevation thereof.

Figure 5 is a similar view in open posi-v elevation of the clamp- Figure 8 is a developed plan view of the yoke;

Figure 9 is a side elevation of the same.

Figure 10 is a side view of the spring.

Figure 1l is a bottom view thereof.

Figure 12 is a sectional side elevation, same as Figure 3, but in clamped position.

In the embodiment of the invention illustrated in the accompanying drawings,` the clamp thumb tack includes-abody-yoke l, a clamping member 2 and a spring 3.

The body-yoke l is preferably formed from sheetmaterial and is substantially rectangular in shape, when in developed form' (see Figures 8 and 9). This member' is bentYV over itself to form two relativelyv llong parallel arms 4 and 5,1 leaving a ,spacey 6 therebetween.

Shaped integrally withv the yokeV 1,'is a I downwardly disposed pointcdprojection 7, whichV serves the same purpose as the commonly known thumb tack.

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The upper arm 4f of the body-yoke l, at

Yth'effront end, is provided with asubstan# tially rectangularopening 8, vand the long sides-,of said opening are provided with oppositely arranged depressed ears 9, in which is pivotally supported the clamping lever 2, in a manner which will be clearly apparent when reference is had to either Figure 6 or 7. y

This clamping lever 2, consists of a fiat )iece of material havin@ a air ofo ositel disposed pinlike extensions l0, which are preferably formed' integrally with the handle part 11, which is relatively widerl at the gripping part.

The forward portion 13 adjacent the pin-l like extensions l0, is bent a purpose later described.

Referring now to Figures 10' and 11, the spring member 3, consists of a flat, flexible piece of material, bent over itself, to form downwardly for an upper arm 14 and a lower'arm 15; this,V

lower arm is tapered, as indicated by theA numeral 16, and terminates into a down wardly projecting extension 17, of slightly less width, than the opening 7a in the bodyyoke l.

With reference to Figures 3 and l2, the' Spring 3 is inserted between the parallel arms 4 and 5, with its closed end adjacent the closed end of the bodyyoke l, and the downward projection 17 slightly entering the triangular opening 7, which thereby prevents the spring from being displaced. Between the pair of ears 9, the clamping member 2 is pivotally inserted in such manner that the pinlike extensions l() come to lie in the ears 9 and the camlike extension 13 of the Clamping member 2 bears against the upper arm i4 of the spring member 3, which has the tendency to normally open up, in a manner as shown in Figure 3.

From the foregoing description, it will be apparent that, when using the clamp thumb tack, the clamping lever should be in closed position, so that the thumb may be used for pushing the clamp thumb tack into the board in the same manner as the com# monly known thumb tacks; the clamping lever is now opened, the paper inserted between the two arms of the spring member 3 and by pushing the clamping lever downwardly the parallel arms of said spring are brought together and due to the pressure exerted the paper or cloth is held rigidly. The same method is employed when the device is used for price tags in grocery stores, etc.

ln reduction to practice, it has been found that lthe form of this invention illustrated in the drawings, and referred to in the above description as the preferred embodi ment, is t e most eiiicient and practical; yet realizing that the conditions concurrent with the adoption of this device will necessarily vary, it is desirable to emphasize the fact that various minor changes in details of construct-ion, proportion and arrangement of parts may be resorted to, when required, without sacrificing any of the advantages of this invention as defined in the appended claims.

l claim as new:

l. A clamp thumb tack comprising a substantially U-shaped yoke member having a depending piercing means formed out of the lower arm of said yoke; a normally outwardly flaring U-shaped lspring member positioned within the bight of said yokeV member and having a downwardly directed projection engaging the aperture created by the formation of said piercing means; a hingedly mounted clamping lever engaging the upper arm of said yoke member and acting upon said spring member, and means for retaining said clamping lever.

2. A clamp thumb tack comprising a substantially U-shaped yoke member having a depending piercing means formed out of the lower arm of said yoke; a normally outwardly flaring U-shaped spring member positioned within the bight of said yoke member and having a downwardly directed projection engaging the aperture created by the formation of said piercing means; a hingedly mounted clamping lever engaging the upper arm of said yoke and acting upon said spring member, and resilient means for retaining said clamping lever.

3. A clamp thumb tack comprising a substantially U-shaped yoke member having'a depending piercing means formed out of the lower arm of said yoke; a normally outwardlyl Haring U-shaped spring member positioned within the bight of said yoke member and having a downwardly directed projection at the outer end of its lower arm for engagement with the aperture created by the formation of said piercing means; a hingedly mountcdfclamping lever engaging the upper arm of said yoke and acting upon said spring member; said clamping lever being retained in position by the outward pressure of said spring member.

In testimony whereof l afliX my signature.

JOHN w. Horn. 

